From: Ryan Cumming <ryan@spitfire.gotdns.org>
To: Andrea Arcangeli <andrea@novell.com>
Subject: Re: [RFC, 2.6] a simple FIFO implementation
Date: Fri, 17 Sep 2004 15:14:36 -0700
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Cc: Stelian Pop <stelian@popies.net>, Hugh Dickins <hugh@veritas.com>,
       James R Bruce <bruce@andrew.cmu.edu>, Andrew Morton <akpm@osdl.org>,
       linux-kernel@vger.kernel.org
References: <20040917154834.GA3180@crusoe.alcove-fr> <200409171454.02531.ryan@spitfire.gotdns.org> <20040917220039.GD15426@dualathlon.random>
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On Friday 17 September 2004 15:00, Andrea Arcangeli wrote:
> This is likely a candidate to go in include/linux/kernel.h (maybe under
> the name roundup_pow_of_two to avoid misunderstanding with the much more
> common PAGE_SIZE roundups)

How does this look?

-Ryan

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=2D-- include/linux/kernel.h	2004-09-16 06:38:19.000000000 -0700
+++ include/linux/kernel.h	2004-09-17 15:12:20.598844004 -0700
@@ -12,6 +12,7 @@
 #include <linux/stddef.h>
 #include <linux/types.h>
 #include <linux/compiler.h>
+#include <linux/bitops.h>
 #include <asm/byteorder.h>
 #include <asm/bug.h>
=20
@@ -111,6 +112,10 @@
 	return r;
 }
=20
+static inline unsigned long __attribute_pure__ roundup_pow_of_two(int x)
+{
+	return (1UL << fls(x));
+}
=20
 extern int printk_ratelimit(void);
 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);

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